ColinR4

I and many others have Sunsynk 8K with Pylontech over charging the Batt Mine is overcharged to 53,66 volt and holds it there for all the afternoon (Batt charged at 11:00 ) No grid feedback Plylontech US3000B spec is Bulk is 53.2 V Float is around 51 V Many uses don't know this and will damage Batt over time This my BMS values from my ICM monitoring software This will kill the batt over time charging it at 53.66 volts continuously Even if you look at the BMS info on the inverter it says charging voltage and also indicates its current charging voltage of 53.66 volts Sunsynk need to bring the charging voltage Down to 52.6 volts to preserve our pylonech batt. From a diff sources : Pylontech are all 15S. Charge voltage is MAX 53.3 If you look at the values indicated by the BMS, you will see that it clearly says 53.3 max voltage. And it is not normal for the inverter to keep the batteries at 53.4 for x hours. When everything is working normally, the voltage rises and falls at normal rates. From Victron When DVCC is enabled, the battery (via the CAN-bms) is responsible for the charge voltage. The Pylontech battery requests a charge voltage of 53.2V. We have however found that in practice this is too high. The Pylontech battery has 15 cells in series, so 53.2V equates to 3.55V per cell. This is very highly charged and makes the system prone to go overvoltage. It should also be noted that a LiFePO4 cell stores very little additional energy above 3.45V. For this reason we opted to override the BMS and cap the voltage at 52.4V. This sacrifices almost none of the capacity and greatly improves the stability of the system. We need to get the attention of the Pylontech uses so we can get this sorted by Sunsynk soonest Regards Colin

I and many others have Sunsynk 8K with Pylontech over charging the Batt Mine is overcharged to 53,66 volt and holds it there for all the afternoon (Batt charged at 11:00 ) No grid feedback Plylontech US3000B spec is Bulk is 53.2 V Float is around 51 V Many uses don't know this and will damage Batt over time This my BMS values from my ICM monitoring software This will kill the batt over time charging it at 53.66 volts continuously Even if you look at the BMS info on the inverter it says charging voltage and also indicates its current charging voltage of 53.66 volts Sunsynk need to bring the charging voltage Down to 52.6 volts to preserve our pylonech batt. From a diff sources : Pylontech are all 15S. Charge voltage is MAX 53.3 If you look at the values indicated by the BMS, you will see that it clearly says 53.3 max voltage. And it is not normal for the inverter to keep the batteries at 53.4 for x hours. When everything is working normally, the voltage rises and falls at normal rates. From Victron When DVCC is enabled, the battery (via the CAN-bms) is responsible for the charge voltage. The Pylontech battery requests a charge voltage of 53.2V. We have however found that in practice this is too high. The Pylontech battery has 15 cells in series, so 53.2V equates to 3.55V per cell. This is very highly charged and makes the system prone to go overvoltage. It should also be noted that a LiFePO4 cell stores very little additional energy above 3.45V. For this reason we opted to override the BMS and cap the voltage at 52.4V. This sacrifices almost none of the capacity and greatly improves the stability of the system. We need to get the attention of the Pylontech uses so we can get this sorted by Sunsynk soonest Regards Colin

I'm Sure you are spot on at 125A DC fuse for 2 Pylon 3.6KW